bill/universal-calculator
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Length is indexed by 1, start counts there

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Bill Ewanick
2023-10-20 02:21:40 -04:00
parent 956e56028f
commit a3dda37643
1 changed files with 4 additions and 5 deletions
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9
src/3n+1/Main.hs
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@@ -7,7 +7,7 @@ import Control.Monad ()
import Debug.Trace (trace) import Debug.Trace (trace)
f' :: Integer -> Integer f' :: Integer -> Integer
f' n = f'' 0 n f' n = f'' 1 n
where where
f'' :: Integer -> Integer -> Integer f'' :: Integer -> Integer -> Integer
f'' i n' f'' i n'
@@ -19,14 +19,13 @@ f' n = f'' 0 n
t'' = trace "\n#######################################################\n" t'' = trace "\n#######################################################\n"
f :: Integer -> Integer f :: Integer -> Integer
f n = s 0 n f n = s 1 n
where where
s :: Integer -> Integer -> Integer s :: Integer -> Integer -> Integer
s i n s i n
| n == 1 = i | n == 1 = i
| even n = s i' (n `div` 2) | even n = s (succ i) (n `div` 2)
| odd n = s i' (3*n + 1) | odd n = s (succ i) (3*n + 1)
where i' = succ i
main :: IO () main :: IO ()
main = print $ map f [2^361..] main = print $ map f [2^361..]